Brake-valve device.



B. S. AIKMAN.

BRAKE VALVE DEVICE,

APPLICATION FILED MAR. 16, 19x5.

Patented Feb. 12, 1918.

m Pa WITNESSES nrrit'ro issnrmlflii"dr anrnwnnnnn W asts; sweats ToavArIoivAniBnnKni-n mnEomRIo-eoMrAnY; or rnmwnoxnng Wisconsin, Aooar'ormrironor vv'xsoolv'smi vravens-verve. nnvrens Thin til who 17bitmay colic m n :1

it known that B R'roN S. Animals,

his inventio'x r relates to fluid pressure bl res, and more particularlyto, a" brake val-refer straight anfl' brake serv ce.

One object of, any invention is to provide an improved brake. valvehaving valves oi.

e-.slidi'ng i o rtyn Another je'ct ifsto provideta selr'elansg,

capito preventnio the entrance .of dnt nto the "brake Ivalve-iv' hen'the handles removed and,'alsmadapted to. prevent the soiling of lotvalve.

4 Another "to provide a impr v d e g te n b ak alre .s

O he -ob bSe i' dvantages wil appe r niore -detalled description the s impanyng. (11TH is tral verti cal'i section of, ahrake valve enibodyin'g'my improvements,-

the Penman-vitae. no l-tie. 255 s '2 l a'v tioal: section of the brakevalve tahenon the linear a" of .Fig. .1, shoivingtheQ-parts -i'n brakeapplication 'position; a1id 31a "fragmentary sect onal view, on the;same plane'as.1 Tig..2,.sho ving.the arts in: release position.' i Q 1Acoord1ng ..:to any; :nrvent1on, the -hrake valve preferably Comprises amain casing; 1, p

a spipe hraolret 2 va 1 1d;' -an intermediate sec tion3','all'a'daptedto be clampedhtogether bymeans of tie bolts l, so that theg nain easingmay be takenoffhy yemofingthe tie 1 bolts, thus permitting change ofvalve or thenlilgey- 'vvithonh disturbing the -pipeoonneo- 1 so 5 andprovided with a downwardly extending stem 9, to Which-is secured anadmission piston valve 10.

A handle stem 11 is provided with a rec.-

tangular projection 12 fitting a correspondving aperture inthe exhaustvalve 6,-the stem i specificationof Letters Patent.

ng j in case ot; contact with. the brake,

' valve,.-and-.a lightcoil-spri11-g-25-acts on the S Patented-Feb. 12,1918.

' fla m tes eant m ,19 5. Serial N j 1144335. I

ll behigfolalnp'ed tofth'e exhaust valve by a bolt. 13. a

The upper end of the stem 11 is made fiat, and "the brake valve handle14; isprovide'd with arorresponding recess; lhe handle, 00 wheninposition, being adapted to bear on thetop' portion of the easing 1 sothat no pressure can be'a'ppli'edto the stem by'doivnward movement ofthe handle.

The chamber above the exhaust valve 6 is open to. atmospheric exhanstpassage l5 and the exhaust valveis provided with a leather seat 16adapted to preventlleakage when the valve is in closed position.

The exhaust valve. 6 controls exhaust ports 1"? in the bushing 5,, whichopen into a cavity 18 which leads to'chamber 19'beloiv the piston head8, said chamber being connected. to hrake cylinder passage 20; 1': v

lhe admission valve 10 isnio n ted within a closed end bushing. 21secured to the section 3 and provided with ports22 controlled by themovement of the piston valve 10 a lid adapted to supply flnid underpres.-

I p surefroin the main" reservoir supply -chamso i Figure 1 her t thcspace above the valve 10.

- Ihe admission valve 510 is provided with preferably a-leather seatZstadapted to.pre vent. leakage in; the closed 1 position. otthe valveand tends to hold same in the seated position. s,

In operation, fluid iuider pressure from the main reservoir beingsupplied-tothe chamber 28, with the parts iii-lap position as shown inFig.1 of-thedrawing, the-:admission valve 10. isseated, so thatthereoan= be no escape offluidffroin chamber23.

It it is desiredto apply-the' brakes, the brake valve handlelitis-Zmovedto the might from -lap' '01-, center-position, @therebyint-z parting' a rotary movement to the exhaust valve6.-:- .t Y Sincethethread in the exhaust valve is right handed, there is a tendency for thevalve to move upwardly on the screw 7, but since upward movement there f'is pr'evented by the seating of the exhaust valve, the screw 7 will bemoved downwardly, r0- v tative movement being prevented by thestationary pins 26 secured to the section 3 and mounted in correspondingrecessesin the piston head '8;

The admission valve 10 is thus moved fron itsseat, Ports throu g hthevalve 10 now permit any fluid in chamber 28 to escape into chamber 19,so that the fluid pressure on opposite sides of the valve piston will beautomatically balanced. M

Further movement of the piston valve 10 Will uncover the ports 22, thuspermitting flow of fluid from the main reservoir charm her-231m thechamber 1 9'and the. brake cylinder, the flow corresponding with theamount of port area uncovered by the movemcnto'f the valve. If the brakevalve han dle is moved to the extreme right hand position, the ports 22are fully opened and supply of" fluid to the brake cylinder takes placein the shortesttime possible.

When the desired pressure is attained in the' brake cylinder the brakevalve handle is moved to lap position, seating the admission valve 10.

In order to release the brakes, the'brake valve handle is moved to theleft from lap position and since the screw 7 is prevented from furtherupward movement by the seating of the piston valve 10,'the exhaust valve6 willtbe moved downwardly awayfromits seat. Fluidin' chamber 29 is thenallowed to' escape through ports 30 in the exhaust valve 6 to exhaustpassage 15, so as to automatically balance the fluid pressures on opposite sides ofv the valve. g Further movement of the exhaust pistonvalve -6 Will"open the ports 17, permitting theescape of fluid from thebrake cylinder to the atmospherethrough cavity 18 and ports-17 toatmospheric exhaust passage 15.

The rateofexhaust from the brake cylinder may be varied according to theextent to which the ports 17 are uncovered and When'the brake valvehandle is turned to the extreme left hand position, the ports 17 arefully opened, thus permitting the exhaust of fluid fromthe' brakecylinder in the shortest possible time.

In order-to prevent dirt and dust from enterlng the bearings, aself-closing cap- 31 is provided, which ishinged to the top of the Icasing 1' and is adapted to automatically close-the handle openingin thebrake valve casin" when the-handle is removed.

This cap also-acts asa' guard to preven passengers clothing from comingin contact with "any oil or grease which might be pres- Copter at thispatent may be ol tained festive cents each',--bya(1d'rzsising -hlie.I1oiliii'iilisloxier ot Pa t'xitp y 1 wal'hington n. G."

' screw-threaded engagementvvith the'exha'usti my hand;

of fluid from'theb'rake cylinder, a handle for rotating the exhaustvalve, and ascre vv carried by the admission valve'andlhav'in'g screwthreaded engagement with the "exhaust valve; said valves being adaptedto unseat upon initial movement in one direction and upon furthermovement ,to'open ports controlled by the periphery of the pi'stonvalve.

2. A brake valve comprising a casing, a noml'otat-ab'le piston valvemounted therein and having 'a plane seat for controlling the admissionoffluid under pressure to the brake cylinder, a piston valvefhav'ing-j aplane seat for controlling the exhaust of fluid from the brakecylinder," a handle for rotating the exhaust valve and a screwsecured tothe admissionyalve'and having valve, said piston valves controllingeiriphe'ral'ports through which the admission" and; release of fluid toand from.the;brake eylinder'is ei'fected-.'

3. The lcombi "ation with a"br ake" valve havinga removable handleand-answe ing for applying the handle to the brake valve, of a cap, forclosing the opening' 'uponjremoval-of .the handle and adapted to engagethe handle when in the "operating position,

to act as'ashield'; I g

4; :The combination with a brake valve new;

ing. a removable; handlei and; an""'openin'g 3 therein forinserting thehandle," offal 's'elfi 7 closing cap for covering the opening upon; vremovalof the handle dndadaptedrtocover. j

the inserted portion; of-"thebr a'kevalveha dle when in the operatingpositiofifl In testimony whereof I-have-herejinto neuron ski-Knit Wit r:I 'JHEhH U'BEL, v

